[英]Python pack to PHP pack
I am trying convert a Python script to PHP. 我正在尝试将Python脚本转换为PHP。 However I am having trouble getting the format right.
但是我无法正确设置格式。
Python: 蟒蛇:
print(hashlib.sha1(struct.pack('L', 1)).hexdigest())
Output: 输出:
3da89ee273be13437e7ecf760f3fbd4dc0e8d1fe
PHP: PHP:
echo sha1(pack('L', 1));
Output: 输出:
3c585604e87f855973731fea83e21fab9392d2fc
Can someone please point me in right direction to get the same output in both languages? 有人可以指出正确的方向,以便在两种语言中获得相同的输出吗?
The differences occurs because of different integer sizes. 之所以发生差异,是因为整数大小不同。 While
L
in the php version of pack() uses hardcoded 32bit integers, Python by default uses the machine integer size. php版本的pack()中的
L
使用硬编码的32位整数,而Python默认情况下使用机器整数大小。 If you are working on a 64bit system you'll notice the difference. 如果您使用的是64位系统,则会注意到其中的区别。 (As shown in the question)
(如问题所示)
You need to use the =
in python to standardize the aligment and the size: 您需要在python中使用
=
来标准化匹配度和大小:
print(hashlib.sha1(struct.pack('=L', 1)).hexdigest())
Output: 输出:
3c585604e87f855973731fea83e21fab9392d2fc
Please refer to this docs: 请参考此文档:
This appears to be a 32 vs 64-bit issue. 这似乎是32位和64位问题。 Are you running a 64-bit version of Python?
您是否正在运行64位版本的Python?
Note that according to the Python docs , L
is an "unsigned long". 请注意,根据Python文档 ,
L
是“无符号长”。 Since you're not specifying a byte order, size and alignment character, Python will default to native . 由于您未指定字节顺序,大小和对齐字符,因此Python将默认为native 。 On Linux, that means 8 bytes on 64-bit, and 4 bytes on 32-bit.
在Linux上,这意味着64位为8个字节,而32位为4个字节。
It's always best to tell Python exactly what you mean when working with binary data: 始终最好告诉Python使用二进制数据时的确切含义:
<
for little-endian, standard size, or <
用于小端,标准尺寸,或 >
for big-endian, standard size. >
对于大端,标准大小。 This will eliminate any differences, depending on what type of machine you're running on. 这将消除任何差异,具体取决于您所运行的计算机类型。
This example shows that you're probably using a 64-bit build of python, as L
== Q
(64-bit). 此示例表明您可能正在使用64位版本的python,如
L
== Q
(64位)。
>>> print(hashlib.sha1(struct.pack('<I', 1)).hexdigest())
3c585604e87f855973731fea83e21fab9392d2fc
>>> print(hashlib.sha1(struct.pack('<Q', 1)).hexdigest())
3da89ee273be13437e7ecf760f3fbd4dc0e8d1fe
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